Accession Number:

ADA207928

Title:

Fast-Algorithm Development for Large-Eddy Simulation of Circular-Jet Turbulence

Descriptive Note:

Final rept. 1 Jan-31 Dec 1988

Corporate Author:

DAYTON UNIV OH RESEARCH INST

Personal Author(s):

Report Date:

1989-03-01

Pagination or Media Count:

91.0

Abstract:

The research reported herein addresses a theoretical investigation of a free, turbulent round jet issuing into a quiescent ambient, and deals with asymptotic analysis for farfield development and subgrid-scale turbulence modeling and with computational considerations for a large-eddy simulation. Higher-order asymptotic analysis of the fully developed downstream region has uncovered new information for the stress- and pressure-function solutions in the exterior region. The analytical predictions of the centerline decay of the mean axial velocity and those of the radial distributions of the axial and radial mean-velocity components and the shear- and normal - stress components compare well with available experimental data and provide the needed farfield boundary conditions for the large-eddy computations. The numerical considerations for the latter examine the construction of hybrid-difference methods that preserve weak but persistent unsteady features, the two-dimensional jet, and dual-variable algorithm for simulating incompressible three-dimensional flows. Asymptotic structure, Farfield development, Free jet, Large Eddy simulation, Round jet, Subgrid scale turbulence, Turbulence modeling.

Subject Categories:

  • Numerical Mathematics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE